>>> arnold schwarzenegger you can't run from your mistakes. you have to confront them. yeah, especially if they look exactly like you and keep calling you dad. [ laughter ] captioning funded by cbs >>> welcome to "cbs this morning." there are just five weeks in the race left for the white house. the two candidates will spend the day preparing for tomorrow night's first debate in denver. a new quinnipiac university poll of likely voters shows president obama leading mitt romney by four points, 49-45. >> last night in denver, romney was endorsed by local football hero john elway. romney told the crowd that the debates will be crucial to the campaign. >> these debates are an opportunity for each of us to describe the pathway forward for america that we would choose. and the american people are going to have to make their choices as to what kind of america they want. >> jan crawford is covering the romney campaign in denver. good morning. >> reporter: good morning, charlie. this is romney's moment. the campaign knows the stakes here. of course, he's done this before. there